Db Mixolydian

The Db Mixolydian mode (also written C#) — Db Eb F Gb Ab Bb Cb — shown across the guitar neck.

Also written C# Mixolydian. C# and Db are the same pitch — Db is the spelling in common use.

Swipe the neck sideways to see the higher frets.

Db Mixolydian is the major scale with one note changed — the b7, Cb. That single note is what the mode sounds like; lean on it and the colour is obvious, avoid it and you are just playing major.

The tool shows this from its parent key, F# major, with C# — the same pitch as Db — marked as where Mixolydian begins, the same seven notes centered on F#.